For 20 years she’s been the best-selling soup lady at the Cái Răng floating market in the south of Việt Nam.

“The buyers fight each other.”

She says.

“To buy my soup.”

The Cái Răng floating market in southern Việt Nam’s Mekong Delta

This is capitalism at its best:

Big boat owners bring in watermelons and pumpkins, cabbages and turnips, garlic and sweet potatoes, from fields as far as 50 miles away.

There is even advertising, of a sort — sellers tie a sample of their goods, like pumpkins or garlic, to a pole.

At wholesale (as in, off the big boat), a watermelon might go for about 25 cents, bought by owners of smaller boats who will peddle their goods at a hundred-percent markup on the canals and streams of the Mekong Delta.

And there are other businesses amid the swarm of boats:

A lottery ticket salesman, who can hardly keep up with demand.

Or the coffee woman — here, Starbucks comes to you!

One boat is like a floating 7-11 with sodas and snacks.

Another is a bobbing sandwich shop.

And like smart business owners everywhere know, sales go better with a smile.

“Customers like to buy from sellers who are laughing and happy.”

Mrs. Tú told Petersen.

“No one wants to buy from someone in a bad mood.”

The floating market has been like this for a thousand years, surviving Asian conquerors come and gone … the Americans, who fought a river war here … even the Communists, who left this slice of capitalism alone.

But times are changing.

A decade ago the floating market stretched nearly a mile.

Today it is half that.

At wholesale (as in, off the big boat), a watermelon might go for about 25 cents, bought by owners of smaller boats who will peddle their goods at a hundred-percent markup on the canals and streams of the Mekong Delta

The tourists, especially the Vietnamese, now come to see a fading part of their own history.

To make life better for the people of the Mekong Delta, there is a push for progress, but progress might just push this age-old market into extinction.

Modern supermarkets sell vegetables in air-conditioned comfort.

New bridges and roads mean trucks, not boats, bring in goods, and shopping is about navigating traffic-jammed roads.

But there is something else changing, and maybe it’s not such a bad thing.

Take 45-year-old Hồ Thị Thanh Vân.

She paddles the canals, selling door-to-door what she bought from the floating market.

She earns maybe 10 dollars a day.

But her daughter is studying English at college.

So she sweats and struggles with a single hope that many share, that she will be the last generation forced to work like this, that her children will have a better life.

And in that hope may be the last real chapter here, because a better future for the next generation will surely mean an end to this little slice of age-old smiling and hustling capitalism that once thrived on the ebb and flow of a mighty river.